Fix entropy_calls when MBEDTLS_ENTROPY_NV_SEED is enabled

Author: gilles-peskine-arm

tests/suites/test_suite_entropy.function

@@ -312,6 +312,13 @@ void entropy_calls( int strength1, int strength2,
                                              &dummy2, threshold,
                                              strength2 ) == 0 );
 
+#if defined(MBEDTLS_ENTROPY_NV_SEED)
+    /* If the NV seed functionality is enabled, there are two entropy
+     * updates: before and after updating the NV seed. */
+    if( result >= 0 )
+        result *= 2;
+#endif
+
     ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) );
 
     if( result >= 0 )